Usually when I see a 3d animation I see a lot of problems in the direction of the scene:
the camera angles are extremely generic.
Or simply a point of view of the person who fucks:
And usually the background has nothing to do with the sexual act.

In selfdrillingsmss masterpiece everything has a reason:
The first shot is outside the car, you see it shaking and you see the sex act itself but it's kind of far and you can't really see what's going on, you are an outsider. this is emphasised by the sound editing: you hear the sound of the birsds way louder then what's inside the car.
Also the angle is slightly higher then the eye level of them fucking so we are like a person outside the car leaning in to see the action.
The second shot really takes us to the action: it is emphasised by the fact the the camera is super wide shot of the car so we get the feeling we are right in the face of the 2 people. And the sound mixing has changed: now we hear the music and the moaning better.
Also we have 2 light sources(orange from upper right frame and white from center down of frame), the 2 sources give it an interesting look,
usually this videos has only one light source or they simply fake a light source to not even bother

All of this little touches may seem obvious but they are very lacking on a lot of 3d animated hentai that I've seen and they're helping to bring life to the scence.
Not to mention the exellent and fluid animation.
I can only wish I cound one day make exellent videos like this one.